/* AINewPath shared design system */
:root{--ink:#0B1020;--night:#121A33;--night2:#18223F;--line:#26304F;--text:#EEF2FF;--muted:#A9B4D6;--teal:#2DD4BF;--violet:#A78BFA;--saffron:#FFB547;--coral:#FF7A59;--ok:#34D399;--r:20px}
*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:clip}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}
body{margin:0;background:var(--ink);color:var(--text);font:17px/1.7 Inter,Manrope,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;overflow-x:hidden}
a{color:var(--teal);text-underline-offset:3px}a:hover{color:var(--saffron)}
.skip{position:absolute;left:-999px;top:8px;background:var(--saffron);color:var(--ink);padding:8px 14px;border-radius:10px;z-index:99}.skip:focus{left:8px}
:focus-visible{outline:3px solid var(--saffron);outline-offset:2px;border-radius:6px}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
h1,h2,h3{font-family:"Space Grotesk",Sora,system-ui,sans-serif;line-height:1.18;letter-spacing:-.02em;margin:1.6em 0 .55em}
h1{font-size:clamp(2rem,5vw,3.3rem);margin-top:.2em}h2{font-size:clamp(1.45rem,3vw,1.9rem)}h3{font-size:1.2rem}
.grad{background:linear-gradient(90deg,var(--teal),var(--violet) 50%,var(--saffron));-webkit-background-clip:text;background-clip:text;color:transparent}
header.nav{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 0;flex-wrap:wrap}
.logo{font-weight:800;font-family:"Space Grotesk",system-ui,sans-serif;font-size:1.1rem;display:flex;gap:.5rem;align-items:center;color:var(--text);text-decoration:none}
.logo i{width:12px;height:12px;border-radius:50%;background:var(--saffron);box-shadow:0 0 16px var(--saffron)}
.xpchip{display:flex;gap:8px;align-items:center;border:1px solid var(--line);border-radius:999px;padding:6px 12px;font-size:.85rem;color:var(--muted);background:var(--night)}
.xpchip b{color:var(--saffron)}
.crumbs{font-size:.85rem;color:var(--muted)}.crumbs a{color:var(--muted)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 20px;border-radius:999px;border:1px solid transparent;font:inherit;font-weight:700;cursor:pointer;text-decoration:none;font-size:.95rem}
.btn-p{background:linear-gradient(90deg,var(--teal),var(--saffron));color:#0B1020}
.btn-g{background:transparent;color:var(--text);border-color:var(--line)}.btn-g:hover{border-color:var(--teal);color:var(--text)}
.btn-s{min-height:38px;padding:0 14px;font-size:.85rem}
.btn[disabled]{opacity:.5;cursor:not-allowed}
/* hero variants */
.hero{position:relative;padding:34px 0 40px;isolation:isolate}
.hero::before{content:"";position:absolute;inset:-40px -20px 0;z-index:-1;background:radial-gradient(900px 420px at 80% 100%,rgba(255,181,71,.18),transparent 60%),radial-gradient(800px 420px at 5% 0%,rgba(167,139,250,.16),transparent 60%)}
.eyebrow{display:inline-flex;gap:8px;align-items:center;padding:6px 12px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:.82rem;background:rgba(18,26,51,.6)}
.hero .lead{color:var(--muted);font-size:1.12rem;max-width:720px}
.hero-meta{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.hero-meta .pill{font-size:.82rem}
.pill{border:1px solid var(--line);border-radius:999px;padding:5px 12px;font-size:.88rem;color:var(--muted);background:var(--night);text-decoration:none}
a.pill:hover{border-color:var(--teal);color:var(--text)}
.v-H2 .hero,.v-H6 .hero{text-align:center}.v-H2 .hero .lead,.v-H6 .hero .lead{margin:0 auto}.v-H2 .hero-meta,.v-H6 .hero-meta{justify-content:center}
.v-H3 .hero h1,.v-H7 .hero h1{border-left:6px solid var(--saffron);padding-left:18px}
.v-H4 .hero::before{background:radial-gradient(700px 380px at 20% 100%,rgba(45,212,191,.2),transparent 60%)}
.v-H5 .hero{border-bottom:1px dashed var(--line)}
.v-H8 .hero h1{font-size:clamp(1.8rem,4.2vw,2.8rem)}
/* layout */
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:40px;align-items:start}
.v-F2 .layout,.v-F6 .layout{grid-template-columns:300px minmax(0,1fr)}.v-F2 .side,.v-F6 .side{order:-1}
.v-F4 .layout,.v-F8 .layout{grid-template-columns:minmax(0,1fr)}.v-F4 .side,.v-F8 .side{position:static}
.side{position:sticky;top:16px;display:grid;gap:16px}
.toc{background:var(--night);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;font-size:.9rem}
.toc ol{margin:.4em 0 0;padding-left:1.2em}.toc a{color:var(--muted);text-decoration:none}.toc a:hover{color:var(--teal)}
.prose{min-width:0}
.prose p,.prose li{color:#D8DEF5}.prose strong{color:var(--text)}
.prose ul,.prose ol{padding-left:1.3em}.prose li{margin:.25em 0}
.prose hr{border:0;border-top:1px solid var(--line);margin:2em 0}
.prose blockquote{margin:1em 0;padding:12px 18px;border-left:4px solid var(--violet);background:var(--night);border-radius:0 14px 14px 0}
.prose code{background:var(--night2);padding:1px 6px;border-radius:6px;font-size:.9em}
.tablewrap{overflow-x:auto;margin:1em 0;border:1px solid var(--line);border-radius:14px}
.prose table{border-collapse:collapse;width:100%;font-size:.93rem}.prose th,.prose td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.prose th{background:var(--night2)}
.prose h2{padding-top:.4em;scroll-margin-top:20px}
.v-V2 .prose h2::before,.v-V4 .prose h2::before{content:"";display:block;width:44px;height:4px;border-radius:4px;background:linear-gradient(90deg,var(--teal),var(--saffron));margin-bottom:12px}
.v-V3 .prose h2{border-bottom:1px solid var(--line);padding-bottom:8px}
.v-V5 .prose h2{color:var(--saffron)}
/* panels / game cards */
.panel{background:linear-gradient(180deg,var(--night),var(--night2));border:1px solid var(--line);border-radius:24px;padding:22px;margin:1.6em 0;position:relative}
.panel h2,.panel h3{margin-top:0}
.panel .kick{font-size:.75rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--saffron)}
.muted{color:var(--muted)}.small{font-size:.86rem}
.sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.status{min-height:1.4em;font-weight:600}.status.ok{color:var(--ok)}.status.bad{color:var(--coral)}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
/* surprise */
.surprise{border-color:rgba(255,181,71,.5);box-shadow:0 0 0 1px rgba(255,181,71,.15),0 20px 60px -30px rgba(255,181,71,.4)}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin:12px 0}
.chip{background:var(--ink);border:1px solid var(--line);color:var(--text);border-radius:14px;padding:10px 14px;font:inherit;font-size:.92rem;cursor:pointer;text-align:left;min-height:44px}
.chip:hover{border-color:var(--teal)}.chip[aria-pressed=true]{border-color:var(--saffron);background:rgba(255,181,71,.12)}
.chip.right{border-color:var(--ok);background:rgba(52,211,153,.12)}.chip.wrong{border-color:var(--coral);background:rgba(255,122,89,.12)}
.slots{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin:12px 0;counter-reset:s}
.slot{min-height:64px;border:2px dashed var(--line);border-radius:14px;padding:10px;display:flex;align-items:center;gap:8px;font-size:.92rem;position:relative}
.slot::before{counter-increment:s;content:counter(s);font-weight:800;color:var(--muted);font-size:.8rem}
.slot.filled{border-style:solid;border-color:var(--violet);background:rgba(167,139,250,.08)}
.slot.over{border-color:var(--saffron)}
.runline{height:6px;border-radius:6px;background:var(--line);overflow:hidden;margin:8px 0}
.runline i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--teal),var(--saffron));transition:width 1.8s ease}
.runline.go i{width:100%}
.cardset{display:grid;gap:14px}
.gcard{background:var(--ink);border:1px solid var(--line);border-radius:18px;padding:16px}
.gcard .opts{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.reveal{margin-top:10px;padding:12px 14px;border-radius:12px;background:rgba(45,212,191,.08);border:1px solid rgba(45,212,191,.35);font-size:.93rem}
.timer{font-variant-numeric:tabular-nums;font-weight:800;font-size:1.4rem;color:var(--saffron)}
.receipt{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:#FFFDF6;color:#1b1b1b;max-width:420px;padding:22px;border-radius:6px;margin:14px 0;box-shadow:0 10px 30px rgba(0,0,0,.4);font-size:.88rem}
.receipt h4{text-align:center;margin:0 0 8px;letter-spacing:.1em}.receipt .ln{display:flex;justify-content:space-between;gap:10px;border-bottom:1px dashed #bbb;padding:6px 0}
.receipt .ln span:last-child{color:#666}
select,input[type=text],textarea{background:var(--ink);color:var(--text);border:1px solid var(--line);border-radius:12px;min-height:44px;padding:8px 12px;font:inherit;max-width:100%}
.out{margin-top:12px;padding:14px;border-radius:14px;background:var(--ink);border:1px solid var(--violet)}
/* quiz */
.q{border:1px solid var(--line);border-radius:18px;padding:16px;margin:12px 0;background:var(--ink)}
.q fieldset{border:0;margin:0;padding:0}.q legend{font-weight:700;margin-bottom:10px;padding:0}
.q label{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border:1px solid var(--line);border-radius:12px;margin:6px 0;cursor:pointer}
.q label:hover{border-color:var(--teal)}.q input{margin-top:5px;accent-color:var(--teal)}
.q label.right{border-color:var(--ok);background:rgba(52,211,153,.1)}.q label.wrong{border-color:var(--coral);background:rgba(255,122,89,.1)}
.q .fb{margin-top:8px;font-size:.93rem}
.score{font-size:1.1rem;font-weight:800}
/* quests */
.qhead{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;align-items:center}
.xpbar{height:12px;border-radius:12px;background:var(--line);overflow:hidden;flex:1;min-width:160px}.xpbar i{display:block;height:100%;background:linear-gradient(90deg,var(--teal),var(--violet),var(--saffron));width:0;transition:width .6s}
.phase{margin-top:16px}.phase h3{margin:0 0 8px;font-size:1rem;color:var(--saffron)}
.quest{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:start;padding:12px;border:1px solid var(--line);border-radius:14px;margin:8px 0;background:var(--ink)}
.quest input{width:22px;height:22px;accent-color:var(--teal);margin-top:3px}
.quest.done{border-color:rgba(52,211,153,.5);background:rgba(52,211,153,.06)}.quest.done .qt{text-decoration:line-through;color:var(--muted)}
.quest .meta{font-size:.78rem;color:var(--muted)}.badge{font-size:.72rem;font-weight:800;padding:3px 8px;border-radius:999px;border:1px solid var(--line);white-space:nowrap}
.badge.proof{color:var(--saffron);border-color:rgba(255,181,71,.5)}.badge.outreach{color:var(--violet);border-color:rgba(167,139,250,.5)}.badge.learning{color:var(--teal);border-color:rgba(45,212,191,.5)}
.smallv{font-size:.85rem;color:var(--muted);margin-top:4px}.smallv button{background:none;border:0;color:var(--teal);cursor:pointer;font:inherit;padding:0;text-decoration:underline}
.paused .quest{opacity:.55}.pausenote{display:none;padding:10px 14px;border-radius:12px;background:rgba(167,139,250,.12);border:1px solid rgba(167,139,250,.4);margin-top:10px}.paused .pausenote{display:block}
/* path card */
.pc-wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px;align-items:center}
.pcard{aspect-ratio:1.6/1;border-radius:22px;padding:22px;background:radial-gradient(500px 260px at 100% 100%,rgba(255,181,71,.35),transparent 60%),radial-gradient(400px 240px at 0 0,rgba(167,139,250,.35),transparent 60%),var(--night2);border:1px solid var(--line);display:flex;flex-direction:column;justify-content:space-between}
.pcard .from{color:var(--muted);font-size:.85rem}.pcard .to{font-family:"Space Grotesk",system-ui,sans-serif;font-size:clamp(1.2rem,3vw,1.7rem);font-weight:800;line-height:1.15}
.pcard .day{font-weight:800;color:var(--saffron)}
/* boxes */
.scam{border-color:rgba(255,122,89,.5);background:linear-gradient(180deg,rgba(255,122,89,.08),var(--night))}
.scam ul{margin:.4em 0 0}
.related{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.rcard{display:block;padding:14px 16px;border:1px solid var(--line);border-radius:16px;background:var(--ink);text-decoration:none;color:var(--text)}
.rcard small{display:block;color:var(--muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.08em}
a.rcard:hover{border-color:var(--teal);transform:translateY(-2px);transition:transform .15s}
.sources{font-size:.88rem}.sources li{margin:.4em 0;word-break:break-word}
footer{border-top:1px solid var(--line);padding:26px 0 50px;color:var(--muted);font-size:.85rem;margin-top:40px}
.toast{position:fixed;left:50%;bottom:20px;transform:translateX(-50%) translateY(120px);background:var(--saffron);color:var(--ink);padding:10px 18px;border-radius:999px;font-weight:800;transition:transform .3s;z-index:50}
.toast.show{transform:translateX(-50%) translateY(0)}
@media (max-width:900px){.layout,.v-F2 .layout,.v-F6 .layout{grid-template-columns:minmax(0,1fr)}.side{position:static;order:0!important}.pc-wrap{grid-template-columns:minmax(0,1fr)}}
@media (max-width:520px){body{font-size:16px}.panel{padding:16px;border-radius:18px}.quest{grid-template-columns:auto minmax(0,1fr) auto;gap:10px;padding:10px}.quest .badge{grid-column:auto;align-self:start;font-size:.68rem;padding:2px 7px}}
@media print{body{background:#fff;color:#000}header.nav,.side,footer,.panel:not(.print-me){display:none}.print-me{border:0;background:#fff}}

.wrow{display:grid;grid-template-columns:1fr;gap:.25rem;margin:.6rem 0}.wrow output{font-size:.85rem;opacity:.8}input[type=range]{width:100%;accent-color:var(--accent,#7cf)}.wtable{width:100%;border-collapse:collapse;margin-top:.8rem;font-size:.9rem}.wtable td,.wtable th{padding:.3rem .4rem;border-bottom:1px solid rgba(255,255,255,.12);text-align:left}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.letter{white-space:pre-wrap;font-family:Georgia,serif;line-height:1.6;background:rgba(255,255,255,.05);padding:1rem;border-radius:12px;margin-top:.8rem;max-width:100%;overflow-wrap:anywhere}.gcard pre,.gcard code{white-space:pre-wrap;overflow-wrap:anywhere}
.wide{flex:1;min-width:0;width:100%}.mock{border:1px solid rgba(255,255,255,.2);border-radius:12px;padding:1rem;background:#fff;color:#1a1a1a;margin:.6rem 0}.mock-bar{font-size:.75rem;color:#888;margin-bottom:.5rem}.mock .chip{background:#1a1a1a;color:#fff}.mock.editing .mock-h{outline:2px dashed #2a7;outline-offset:3px}.diffgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:.8rem}.dspot{display:block;width:100%;text-align:left;background:#fff;color:#222;border:1px solid #ddd;border-radius:6px;margin:.3rem 0;cursor:pointer;font:inherit}.dspot.right{box-shadow:0 0 0 3px #2c9}.track{position:relative;height:3rem;background:rgba(255,255,255,.06);border-radius:10px;margin:.6rem 0;overflow:hidden}.sq{position:absolute;left:.25rem;top:.5rem;width:2rem;height:2rem;border-radius:6px;background:linear-gradient(135deg,#7cf,#6e9)}.lowc{color:#5b6475;background:#141b2d;padding:.4rem;border-radius:6px}.fixc{color:#e8ecf4;background:#141b2d;padding:.4rem;border-radius:6px}.trace{display:flex;flex-direction:column;gap:.25rem}.tline{text-align:left;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);color:inherit;padding:.35rem .5rem;border-radius:6px;cursor:pointer;overflow-wrap:anywhere}.tline.amber{border-color:#fb3;color:#fd8}pre.mono{white-space:pre-wrap;overflow-wrap:anywhere}
.tline.lit{outline:2px solid #fd8;background:rgba(255,220,120,.15)}.pc0{border-left:4px solid #7cf}.pc1{border-left:4px solid #6e9}.pc2{border-left:4px solid #fc6}.pc3{border-left:4px solid #f9a}.pc4{border-left:4px solid #b9f}.pc5{border-left:4px solid #9df}.paper{background:#f4efe3;color:#333;padding:.8rem;border-radius:6px}.pcard.glow{box-shadow:0 0 0 4px rgba(120,220,160,.6);transition:box-shadow .3s}fieldset.wrow{border:1px solid rgba(255,255,255,.15);border-radius:8px;padding:.5rem}
.bingo{display:grid;grid-template-columns:repeat(3,1fr);gap:.35rem;margin:.6rem 0}.sq9{min-height:3.5rem;white-space:normal;font-size:.8rem}.sparkle{animation:spk .5s ease-out}@keyframes spk{from{opacity:0;transform:scale(.97)}to{opacity:1;transform:none}}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
/* ---- site shell ---- */
.site-nav{display:flex;gap:4px;margin-left:auto}
.site-nav a{color:var(--text);text-decoration:none;padding:8px 14px;border-radius:999px;font-weight:600;font-size:.95rem}
.site-nav a:hover{background:var(--night)}.site-nav a[aria-current=page]{background:var(--night);border:1px solid var(--line)}
.site-foot .foot-nav{display:flex;flex-wrap:wrap;gap:6px 18px;margin-bottom:10px}.site-foot .foot-nav a{color:var(--text);text-decoration:none;font-weight:600}
.site-foot .scamline{color:var(--muted)}
@media (max-width:520px){header.nav{gap:8px}.site-nav{order:3;width:100%;margin-left:0;justify-content:flex-start}.site-nav a{padding:6px 12px}.xpchip{margin-left:auto}}
/* ---- homepage & directory ---- */
.hhero{padding:28px 0 40px}.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:36px;align-items:center}
.hhero h1{font-size:clamp(2.1rem,5.4vw,3.6rem)}.ctas{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0 10px}
.tree svg{width:100%;height:auto;max-width:420px;display:block;margin:0 auto}
.hsec{padding:34px 0;border-top:1px solid var(--line)}.hsec h2{margin-top:0}
.steps{list-style:none;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{background:var(--night);border:1px solid var(--line);border-radius:var(--r);padding:22px}.card h3{margin:.4em 0 .3em}.card p{color:var(--muted);margin:0}
.card .k{font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase}
.picker{display:grid;gap:8px;max-width:640px;margin-bottom:18px}.picker select{flex:1;min-width:200px}
.picker input,.join input,.join select{width:100%;min-height:48px;padding:0 14px;border-radius:14px;border:1px solid var(--line);background:var(--ink);color:var(--text);font:inherit}
.rolegrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.rolecard{display:grid;gap:4px;padding:16px;border:1px solid var(--line);border-radius:16px;background:var(--night);text-decoration:none;color:var(--text)}
.rolecard span{color:var(--muted);font-size:.86rem;line-height:1.45}.rolecard:hover{border-color:var(--teal)}
.feat .rcard em{display:block;font-style:normal;color:var(--muted);font-size:.86rem;line-height:1.45;margin-top:4px}
.inside{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:10px}.inside li{background:var(--night);border:1px solid var(--line);border-radius:14px;padding:12px 14px;color:var(--muted)}.inside b{color:var(--text)}
.join{background:linear-gradient(180deg,var(--night),rgba(255,181,71,.08));border:1px solid var(--line);border-radius:24px;padding:30px;display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center}
.join form{display:grid;gap:12px}.join label{font-size:.9rem;color:var(--muted)}
.msg{min-height:1.5em;font-size:.95rem}.msg.ok{color:var(--teal)}.msg.err{color:var(--coral)}
.honest{font-size:.88rem;color:var(--muted);border-left:3px solid var(--saffron);padding-left:12px}
.dir{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}
.dircard{border:1px solid var(--line);border-radius:18px;background:var(--night);padding:16px 18px}
.dirhead{font-family:"Space Grotesk",system-ui,sans-serif;font-weight:700;font-size:1.1rem;color:var(--text);text-decoration:none}
.dircard ul{list-style:none;padding:0;margin:8px 0 0;display:grid;gap:4px}.dircard li a{text-decoration:none}
.narrow{max-width:760px}
@media (max-width:860px){.hero-grid,.join{grid-template-columns:1fr}.steps{grid-template-columns:1fr}.tree{max-width:340px;margin:0 auto}.join{padding:22px}}
/* ---- in-page widgets ---- */
.checklist{list-style:none;padding-left:0}.checklist li.chk{margin:.35em 0}
.checklist label{display:flex;gap:10px;align-items:flex-start;cursor:pointer}.checklist input{width:20px;height:20px;margin-top:.3em;accent-color:var(--teal);flex:none}
.checklist li.done span{color:var(--muted);text-decoration:line-through;text-decoration-color:var(--teal)}
.wprog{display:flex;align-items:center;gap:10px;font-size:.86rem;color:var(--muted);margin:.6em 0 .2em}.wprog i{flex:1;max-width:260px;height:8px;border-radius:9px;background:var(--night2);overflow:hidden;position:relative}.wprog i b{position:absolute;inset:0 auto 0 0;background:linear-gradient(90deg,var(--teal),var(--saffron));border-radius:9px;transition:width .3s}
.whint{font-size:.86rem;color:var(--muted);margin-bottom:.4em}
.flips{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px}
.flip{width:100%;height:100%;min-height:96px;text-align:left;font:inherit;font-size:.95rem;line-height:1.5;color:var(--text);background:var(--night);border:1px solid var(--line);border-radius:16px;padding:14px 16px;cursor:pointer;display:grid;align-content:start;gap:6px}
.flip small{display:block;color:var(--violet);font-size:.72rem;text-transform:uppercase;letter-spacing:.08em}
.flip:hover{border-color:var(--teal)}.flip[aria-expanded=true]{background:var(--night2);border-color:var(--teal)}.flip[aria-expanded=true] .ff{color:var(--muted);font-size:.85rem}.flip .fb{color:var(--teal)}
.wslider{background:var(--night);border:1px solid var(--line);border-radius:18px;padding:16px 18px;margin:1em 0}.wslider input{width:100%;accent-color:var(--saffron);margin-top:8px}
.wticks{display:flex;justify-content:space-between;gap:8px;font-size:.78rem;color:var(--muted);margin-bottom:8px}.wticks span{flex:1;text-align:center}.wticks span:first-child{text-align:left}.wticks span:last-child{text-align:right}
.wsl{list-style:none;padding:0;margin:0}.wsl li{display:none}.wsl li.on{display:block}
.wtabs [role=tablist]{display:flex;gap:6px;margin:.5em 0}.wtabs [role=tab]{font:inherit;font-weight:600;color:var(--text);background:var(--night);border:1px solid var(--line);border-radius:999px;padding:6px 16px;cursor:pointer}.wtabs [role=tab][aria-selected=true]{background:var(--teal);color:var(--ink);border-color:var(--teal)}
.wtabs [role=tabpanel]{background:var(--night);border:1px solid var(--line);border-radius:16px;padding:4px 16px}
/* ---- UX polish v4: tighter rhythm, readable measure, no dead space ---- */
body{line-height:1.65}
h1,h2,h3{margin:1.25em 0 .45em}h1{margin-top:.15em}
.prose>:first-child{margin-top:0}
.prose h2{padding-top:.2em;margin-top:1.5em;scroll-margin-top:16px}
.prose p,.prose ul,.prose ol{margin:.6em 0}
.prose p,.prose li,.prose blockquote,.prose>h2,.prose>h3{max-width:72ch}
.prose hr{margin:1.4em 0}
.hero{padding:22px 0 26px}.hero .lead{margin:.4em 0 0}.hero-meta{margin-top:14px}
.layout{grid-template-columns:minmax(0,1fr) 280px;gap:32px}
.v-F2 .layout,.v-F6 .layout{grid-template-columns:260px minmax(0,1fr)}
.side{top:12px;max-height:calc(100vh - 24px);overflow:auto}
.toc{padding:14px 16px}.toc li{margin:.15em 0;line-height:1.4}
.panel{padding:20px 22px;margin:1.2em 0}
.panel>p:last-child,.panel>ul:last-child{margin-bottom:0}
.tablewrap{margin:.8em 0;-webkit-overflow-scrolling:touch;background:var(--night)}
.tablewrap table{min-width:0}.prose th,.prose td{padding:9px 12px;line-height:1.5}
.prose th{position:sticky;top:0;font-size:.85rem;letter-spacing:.01em}
.prose tr:last-child td{border-bottom:0}
.prose tbody tr:nth-child(even) td{background:rgba(255,255,255,.02)}
.hsec{padding:28px 0}.hhero{padding:20px 0 28px}
footer{margin-top:28px;padding:22px 0 32px}
.related{margin-top:.6em}
@media (max-width:900px){.layout,.v-F2 .layout,.v-F6 .layout{grid-template-columns:minmax(0,1fr)}.side{max-height:none;overflow:visible;position:static}.toc ol{columns:1}}
@media (max-width:640px){
 .wrap{padding:0 16px}
 h1{font-size:clamp(1.75rem,8vw,2.2rem)}
 .hero{padding:14px 0 18px}.hero .lead{font-size:1.02rem}
 .layout{gap:20px}
 .panel{padding:16px;margin:1em 0}
 .tablewrap{margin:.8em -2px}
 .tablewrap table:has(th:nth-child(4)){min-width:560px}
 .prose th,.prose td{padding:8px 10px;font-size:.88rem}
 .prose h2{margin-top:1.3em}
}
.site-foot{text-align:center}.site-foot p{margin:.35em 0}.site-foot .foot-nav{justify-content:center;margin:10px 0}.site-foot .fbrand b{font-weight:800}.site-foot .fdisc,.site-foot .fcopy{font-size:.85rem;color:var(--muted)}